IControlChangeNotify::OnNotify

  • Article
Previous Next

IControlChangeNotify::OnNotify

The OnNotify method notifies the client when the status of a connector or subunit changes.

HRESULT OnNotify(
  DWORD  dwSenderProcessId,
  LPCWORD  pguidEventContext
);

Parameters

dwSenderProcessId

[in]  The process ID of the client that changed the state of the control. If a notification is generated by a hardware event, this process ID will differ from the client's process ID. For more information, see Remarks.

pguidEventContext

[in]  The context GUID for the control-change event. The client that initiates the control change supplies this GUID. For more information, see Remarks.

Return Value

If the method succeeds, it returns S_OK. If it fails, it returns an error code.

Remarks

A client can use this method to keep track of control changes made by other processes and by the hardware. However, a client that changes a control setting can typically disregard the notification that the control change generates. In its implementation of the OnNotify method, a client can inspect the dwSenderProcessId and pguidEventContext parameters to discover whether it or another client is the source of the control-change event.

Requirements

Client: Windows Vista

Header: Include Devicetopology.h.

See Also

Previous Next